Phe2-orn8-oxytocin



United States Patent "ice 3,352,843

Patented Nov. 14, 1967 to give the polypeptide of Formula I and, when it is de- 3,352,843 sired to produce an acid addition salt, reacting this with PHEZ-ORNS-OXYTOCIN an organic or inorganic acid by methods known per se.

Roger Boissonnas, Bottmingen, Ren Huguenin, Reinach, Basel-Land, Botond Berde, Basel, and Walter Schalch, Riehen, Switzerland, assignors to Sandoz Ltd. (also The nonapeptide derivative IV may, for example, be obtained by methods for the synthesis of peptides in known as Sandoz Basel, Switzerland actual use or described in the literature on the sub ect, it No Drawing. Filed Aug. 27, 1964, Ser. No. 392,595 bemg p e to together t e mmo acids 1n the Claims priority, application Switzerland, Aug. 30, 1963, Order Indicated in general Formula IV one at a time or 10,772/63, 10,773/63 by first forming constituent peptide units and joining 3 Claims. 10 these together.

The nonapeptide derivative IV may, for example, be The present invention relates to a new polypeptide produced in that a hexapeptide derivative of general and to a process for its production. Formula II,

N HR

CONE, 0H, (3H, CONH; S R" CHI-CHI 5H; Hz C Hz (1H, (1H, (3 H1 NH CHC O--NH-OHC O-NH( JHC O--NCHC O-NH-HCONH-CH:CONH Glu Asp Cys Pro 0m Giy II The present invention provides the polypeptide of Formula I, in which R and R" have the above significance, is con- N H: C H; C O NH: JHI 6 s 2 IHz M- H2 I H: CH1 CHE-CH3 CH1 CH3 CH1 CH3 NHa-CH-C O-NH-H-C O-NHCH-C O-NH( }HC O-NHCHCO-NHCHCONCHC O-NH-CHC ONECHgC ONE:

('JH, Pro Orn Gly l i Cys Phe Ile Glu Asp Cys I densed with a reactive derivative of a free acid of genits acid addition salts as well as therapeutical combinaeral Formula III, tions thereof. on, The present invention further provides a process for 05H E the production of Compound I and its acid addition salts l 1 H which comprises splitting 01f the protective radicals R 5 GEL-O 3 and R" in one or more stages from a nonapeptide derivative of general Formula IV In NHR 0H, CONE! CE, W sl-n" can. on, I H1 coNH, SIR" era-0H, 0H, 0H: 1H, H-CHz on, 111 111, Ha Ha NHCHCO-NH-CH-CO-NH-CH-CO-NH-CH-CONH-OHCONH-CH-CO-NCHC0NHCH-CO-NH-CHz-CONH;

Cys Pho Ile Glu Asp Cys Pro Orn Gly in which R denotes a radical capable of protecting an in which R and R" have the above significance.

amino radical in peptide synthesis, and R" denotes a Examples of radicals for protecting the amino radical radical capable of protecting a sulfhydryl radical in in the above process by terngorarily blocking it are the peptide synthesis, carbobenzoxy, p-chlorobenzyloxy, p-toluenesulfonyl or oxidizing the resulting nonapeptide of Formula V triphenylmethyl radicals, while examples of radicals for CH; CONE, H:

SH 05H; (EH: CH; 0 ONE] SH GHQ-CH: CH3

Cys Phe Ile Glu Asp Cys Pro Orn Gly protecting the s'ulfhyd'ryl radical 'a'ie'tliebenylfp-bhlofobenzyl or p-xylyl radicals. It'is preferred, however, to use the benzyl radical. Examples of reactive derivatives of a free acid'of general Formula III are the azide, the pnitrophenylester, the 2,4,5-trichlorophenylester, the-unsymmetrical'anhydrides as well as the reaction product at the acid "IIIwithdicyclohexylcarbodiimide.

It should be noted that the 'iionape'ptide derivative 1V need not be produced in the manner'd'escribed above, but it may likewise be produced 'by' 'c'o'ndensation of two polypeptides other than the ones indicated above (or a polypeptide and -an aminoacid) in 'the forrnof their protectedderivatives. i

The starting materialsfor -producing thehonap'eptide derivativeIV, -ins'ofar asthey were hitherto unknown, may be obtained by methods for the synthesis of peptides in actual use or described in the literature on the subject, it being possible to 'join together the amino acids one at a time or by first forming constituent peptide units and joining these together. p

Oxidation of the non'apeptide V 'to give the desired final product I may be effected by oxidation in aqueous solution at a pH value of 4 to 9, preferably with hydrogen peroxide or potassium ferricyanide or by introducin g air or oxygen.

The resulting polypeptide I may be converted into its acid addition salts by reaction with inorganic or organic acids in manner known per'se. Examples 'of'ac'ids suitable for acid salt formation with Compound I are as follows: hydrochloric, hydrobromic, sulfuric, fumaric, malic, maleic, acetic and tartaric acid.

The polypeptide of the invention differs from vascopressin in that it contains an ornithine radical in the place of the lysine radical (vasopressin from pigs) or the arginine radical (vasopressin from cattle) an isoleucine radical in place of the phenylalanine radical and a phenylalanine radical in place of the tyrosineradical. The polypeptide I differs from oxytocin in that it contains a phenylalanine radicalin place of the tyrosine radical and an ornithine radical in place of the leucine radical. The new polypeptide I may, therefore, also be called Phe Orn -oxytocin.

Compound I was a vasoconstrictive effect 'alr'nostequal to that of natural vasopressins; however, as opposed to the natural vasopressins, compound I has virtually no antidiuretic effect and as opposed to natural oxytocin it has almost no oxytocic effect, and is thus suggested for use in therapy as a substance having a specific 'vasoconstri'ctive effect. This specific vasoconstrictive effect of compound I results from a direct influence on the vascular muscles; for this reason no appreciable side effects on the vegetative nervous system are produced'as'is the case with adrenalin and noradrenalin.

The properties of compoundI are especially useful in the prophylaxis and therapy of parenchymatousbleeding, whereby infiltration of the tissues with compound 1 produces a pronounced'ischae'mic effect. The properties of compound I are, furthermore, of special use in surgery of the throat, nose and ear, in gynecology and obstetrics, in urology and dentistry.

A combinati'on'of eompound-I'with a local anaesthetic shows especially valuable thera'peutic'al properties.

It'has hitherto been known that by the combination of adrenalin with a-local anaesthetic it waspossible to obtain a longer duration of anaesthesia and a decrease of local plethora and thus, a reduction of blood loss during surgery. Due to the known general side effectsof adrenalin on blood circulation (for example suddden rise in blood pressure, an increase in the'frequency of the heartbeats, secondary blood pressure decrease, collapse) and on the central nervous system (for example tension and excitation) as well as the frequently occurring reactive hyperaemia caused by the speeding up of'local metabolism, it has recently been recommended to use, in place of adrenalin, vasopressin or vasopressin-like peptides in "combination "with "a "local anaesthetic, rorexa'rnple local anaesthetics. The amount of polypeptide I required for this purpose is considerably smaller than that of other vasopressin-like peptides in even than of adrenalin.

Due to its high local vasoconstrictive activity, the new polypeptide in combination withaflocal anaesthetic is therefore also especially indicated for decreasing local plethora and reducing blood loss during surgery. It is.

preferred to use for these combinations local anaesthetics which have a good water solubility and which are suitable for the preparation of stable, sterilizable solutions.

The polypeptide of the invention may be used as free base or as an addition salt with organic or inorganic acids, either on its own or in the form of appropriate medicinal preparations for administration, e.g., parenterally, enterally or intranasally. In order to produce such medicinal preparations, the compound is worked up with organic or inorganic adjuvants whichare'inert'andphysiologically acceptable. Examples of such adjuvants are as follows-- tablets and dragees: lactose, starch, talc and stearic acid; syrups: solutions of can sugar, invert sugar and glucose; injectable solutions: water, alcohols, glycerin andvegetable oils; suppositories: natural or hardened oils and waxes; intranasal sprays: water, glycerin or other liquid substances tolerated by the mucous membranes.

The preparations may furthermore contain one or more suitable preserving, stabilizing or wetting agents, solubilizers, sweetening and coloring substancesor fiavorings.

In the follow examples all temperatures are indicated in degrees centigrade.

EXAMPLE 1 (a) N-a-carbdbenzoxy-N-fi-p-to hienesulfonyl L- ornithyl-glycine ethyl ester g. of N-e carbohenzoxy N-d-p-toluensulforiyl-L- ornithyl-glycine ethyl ester are dissolved in 800 'cc. of anhydrous acetic acid which has been saturated with hydrogen bromide. The solution is left to stand for one hourat 20, evaporation is effected in a vacuum below 40 and the residue is carefully washed with diethyl ether. The residue is dissolved in 500 cc. of acetonitrile, 25 cc. of triethylamine and 43 g. of N-carbobenzoxy-L- proline are added, cooling is effected at 0, 35.5 g. of dic'yclohexylcarbodiimide are added and shaking is effected over night at 20. After filtering off dicyclohexylurea, the filtrate is evaporated in a vacuum at 30, the

residue is dissolved in ethyl acetate 'ai'id this solutio'n is washed with dilute sulfuric acid and aqueous ammonia. After drying over sodium sulfate, the ethyl acetate is evaporated in a vacuum and the residue is dissolved in 1 litre of absolute ethanol. The solution is cooled at saturated with ammonia and left to stand over night at 20. After evaporating in a vacuum at 30, the residue is dissolved in 100 ml. of dimethylformamide and crystallized by the addition of 1500 ml. of ethyl acetate. N- carbobenzoxy L prolyl N a p-toluenesulfonyl-L- ornithyl-glycinamide is obtained: melting point 122 (decomposition). [a] =46 (95% glacial acetic acid).

(0) N oarbobenzoxy L glutaminyl-L-asparaginyl-S- benzyl L cysleinyl-L-prolyl-N-ii-p-toluenesulfonyl- L-ornithyl-glycinamide 100 g. of N-carbobenzoxy-L-prolyl-N-a-p-toluenesulfonyl-L-ornithyl-glycinamide are dissolved in 500 cc. of anhydrous acetic acid which has been saturated with hydrogen bromide, the solution is left to stand for one hour at 20 and evaporation is effected in a vacuum below 40. The residue is carefully washed with diethyl ether and then added to a solution of 100 g. of N-carbobenzoxy L glutaminyl L asparaginyl S benzyl-L- cysteinyl azide [Boissonnas & coll., Helv. chim. Acta, 38, 1491 (1955)] and 26 cc. of triethylamine in 1000 cc. of dimethylformamide. The mixture is left to stand over night at 20, 3000 cc. of ethyl acetate are added thereto, the precipitate is filtered off and washing is effected with ethyl acetate. N- carbobenzoxy-L-glutaminyl-L- asparaginyl S benzyl L cysteinyl-L-prolyl-N-6-ptoluenesulfonyl-L-ornithyl-glycinamide is obtained; melting point 188 (decomposition); [a] =33 (dimethylform amide (d) N carbobenzoxy S-benzyl-L-cysteinyl-bphenyl 50 g. of N-carbobenzoxy-L-glutaminyl-L-asparaginyl- S benzyl L-cysteinyl-L-prolyl-N-fi-p-toluenesulfonyl- L-ornithyl-glycinamide are dissolved in 250 cc. of anhydrous acetic acid which has been saturated with hydrogen bromide and the solution is left to stand for one hour at 20. After evaporating the solvent in a vacuum below 40, the residue is carefully washed with diethyl ether and a solution of 31.1 g. of N-carbobenzoxy-S- benzyl-L-cysteinyl-L-phenylalanyl-L-isoleucyl-azide and 7.5 cc. of triethylamine in 250 cc. of dimethylformamide is added thereto. The mixture is left to stand for 2 days at 20, 1000 cc. of ethyl acetate are then added and the precipitate is washed with ethyl acetate. After drying in a vacuum at 30, the product is washed with warm methanol. N carbobenzoxy S-benZyl-L-cysteinyl-L-phenylalanyl L isoleucyl L glutaminyl-L-asparaginyl-S- benzyl L cysteinyl-L-prolyl-N-fi-p-toluenesulfonyl-L- ornithyl-glycinamide is obtained. Melting point 242; [u] =-4Q (dimethylformamide).

(e) L cysteinyl L phenylalanyl L isoleucyl L glutaminyl L asparaginyl-L-cysteinyl-L-prolyl-L-omithyl-glycinamide The necessary amount of sodium or potassium metal is added to a solution of 5 g. of N-carbobenzoxy-S-benzyl- L cysteinyl L- phenylalanyl-L-isoleucyl-L-glutaminyl- L asparaginyl -S- benzyl L-cysteinyl-L-prolyl-N-fi-ptoluenesulfonyl-L-ornithyl-glycinamide in 1200 cc. of dry liquid ammonia, while stirring at the boiling temperature of the solution, to give a permanent blue coloration. After the addition of 3 g. of ammonium chloride, the solution is evaporated to dryness. The residue contains L cysteinyl L- phenylalanyl L isoleucyl L glutaminyl L asparaginyl L cysteinyl L prolyl L- ornithyl-glycinamide.

(f) Phe -orn -oxytocin The residue, containing L-cysteinyl-L-phenylalanyl-L- isoleucyl L glutaminyl L asparaginyl L cysteinyl L prolyl L ornithyl glycinamide, is dissolved in 5 litres of 0.01 N acetic acid and oxidized at a pH value of 6.5-8.0 by introducing air or oxygen for one hour at 0-40. The solution is brought to a pH value of 4.05.0 and after the addition of 50 g. of sodium chloride or 0.64 g. of methanesulfonic acid or 0.76 g. of trifluoroacetic acid, evaporation to dryness is effected, whereby a dry powder results which keeps well. It may be stored and when used it may be dissolved to give a clear solution. However, the solution may also be used as such, if desired after diluting with water or a salt solution.

In order to remove the inorganic salts, the above powder obtained after the addition of trifluoroacetic acid may be subjected to counter current distribution in the system sec. butanol/water/trifluoroacetic acid 120:160:1. After 200 transfer stages the substance is present in tubes 47 to 66 with a maximum in tube 56 (K=0.39). After evaporation, the active polypeptide is obtained in a good yield in the form of its hydroscopic trifluoroacetate, which behaves uniformly in chromatography and electrophoresis. Migration in paper electrophoresis at a pH value of 5.8 and 40 v./cm.: 49 mm. in 60 minutes (the histidine used as standard migrates 65 mm.). Migration in paper electrophoresis at a pH value of 1.9 and 40 v./cm.: 68 mm. in 60 minutes (the tryptophane used as standard migrates 66 mm.). Rf in paper chromatography in the system isoamyl alcohol/pyridine/water 35:35:30=0.25. Total hydrolysis (16 hours, 6 N HCl) yields the following amino acids in equimolecular quantities: cystine, glutamic acid, asparaginic acid, proline, ornithine, glycine, phenylalanine and isoleucine. The compound has the following biological activities: IU/mg. on the blood pressure of the rat, 0.6 IU/rng. on the inhibition of diuresis of the rat and approximately 1 IU/mg. on the uterus of the rat.

EXAMPLE 2 The same procedure as in Example 1 is used, except that final oxidation is effected at 040 by the addition of 7.5 cc. of a N solution of hydrogen peroxide in water at a pH value of 4.0-9.0 (instead of oxidation by introducing air or oxygen).

EXAMPLE 3 The same procedure as in Example 1 is used, except that final oxidation is effected at 035 by the addition of 6.7 cc. of a N solution of potassium ferricyanide in water at a pH value of 5.5-7.5.

EXAMPLE 4 Solution for infiltration anaesthesia:

Phe -orn -oxytocin g 0.0005 Z-diethylamino-2',6'-aceto-xylidide hydrochloride (lidocaine chloride) g 5.0 Trichloro-isobutyl alcohol g 5.0 Ethyl alcohol 94%, analytically pure -g 5.0 Glacial acetic acid g 1.0 Sodium acetate.3H O g 2.0

Distilled water to make up one litre.

Production .7 r 8 EXAMPLE 5 EXAMPLE 7 S lu i f l st si Solution for surface anaesthesia:

o Phe -Orn -ox toein 0.001 h 2- a- Y g VP 6 9 9 g 0 001 (i)-N-(Z-Propylaimindpropionyl) Z-toluidine hypyl t y mpn l hy r hl dmchloride (exadrin) 300 rlde i e e hydrochlonde) --g-- S chlofide 81) A y s d s mm p p a -g .0 Sodiurn aCetate.3H O 'g 1,0 Citric acidJH O -g 3.0 Gla al acetic aeid g 0.5 Distilled water to make up one litre. 10 Methyl'p'hydroxybenzoate Distilled water to make up one litre.

Production Production V v l v The methyl-p-hydroii$ henioate, the sodiliin. chloride, The citric acid, the disodiiirn phosphate and the novothe glaeial acetic acid and the sodiurn acetate are diseaine hydrochloride are dissolved in 900 m1. of distilled F FlF .v fil i ilg d t? th :)-1 -(2;'prohi h d py ammo proplony -to I11 1 ne y IOCh QIIdG is added waterw 1e Surfing t e P e Om Oxytocm 1S adde wa and, after dissolving, the Phe -Orn -ox'ytocin is added.

"ter is added to makeu'p one litre, filtration is effected f difi waf to m k up one litre, the process is through a membrane filter, the solution is filled in amfu' th ff f d as described in Example POIilCS and sterilized by heating for 6 minutes at 120. What is claimedis:

1. The polypeptide of the formula:

NH: on, CONE, H1 c rri en, E, CONE, CHi-CH, H, +11, H- CH; H, H, in :11, Nm-CEoo-NH-QH-CQ-NH-dH-CoJiH-oHQo-NB-eH-oo-NH-(JH co-N-dH-ooNH-dH-ooNHoH,co1 iH,

I H, l H: Pro 0m Gly s l S Cys Phe I lie Glii Asp Gi s "EXAMPLE 6 2 3? Surfa anaesthes 0002 aiidits iihysiologieally aeceptahle acid addition salts Phe m 'oxytocin wherein all th'e'arn'ino acid' rou in s exce t 1 cine ar -Am n a i 5:.S i9 llY ?P Q i l f 55 fgtw g p g p H e ethyl ester methanesulfonate (leucinocainiim 10 U I met hanesfilfonateD -Qg-.. 100 L y g gy}; l p y e y sql cyl-L glnta Glacial acetic, acid. -g nunyl L paraginyl-L-cysteinyl L-fifopyl L-ornithyb Sodiuiln afifitlfltfl-3lggo --"g-- g lycinamid. and its acid addition salts. Propy -py roxy enzoate --g-- 3 Acom ound of the formula- Methyl-p-hydroxybenzoate g 2-0 '45 p Distilled water to make up one litre.

NEl R' "eh. CONE. I H, 8-H 00H: "$11: 31 lJONH: CH: 111, E, dB- ort, (in, 0H, Er, I :5, $11, R'NH-QHQO-NE-OH-CO-NHOHCO-NHCH-CO-NHHCO-NH- H CON $H-G0--NH-JHC0-NH-Clin-CONH,

C's ihe fie Glu Asp Cys Pro om 'dly lr'biz zw tz'on The prdpyLp-h droxybenzoate, th ijiethylfp hj droxywherein R is selected from the group' consisting of carbllzoaie, 2 3 f F df d l fi bobenzoxy, p-ch-lorocarbobenzyloxy, p-toluenesulphonyl Ya'r'e dis'sblved'in smuml-bf'idistmd Wale? E lqlmim' and trilihe'nylmet'hyl, and R is selected from the group i'iig, the Phe -Ofn -oxytoein is "added. After adding wav w \d--f1'- i7 I I V camurn methanesulfonate is added and, after ISSIOV ng g l y s pj m p y and F Y YL 911mb ter to make up one litr'efthe process is further effeeted i l acid b' i except glycine bang 0f as described in Example 1. tion.

I v References cit'd I v Boissonnas et at: Experientia 17, 377-390(1961). Huguenin et 'al.: Helvetica ChirnieACta 46, 16694676 (1963). LEWIS GOTIiS, Primary Examiner. ELBBRT L. ROBERTS, Examiner. 

1. THE POLYPEPTIDE OF THE FORMULA: (-NH-CO-CH(-CH2-CO-NH2)-NH-CO-CH(-CH2-CH2-CO-NH2)-NH-COCH(-CH(-CH3)-CH2-CH2)-NH-CO-CH(-CH2-C6H5)-NH-CO-CH(-NH2)S-S-CH2-)>CH-CO-(PYRROLIDIN-1,2-YLENE)-CO-NH-CH(-CH2-CH2CH2-NH2)-CO-NH-CH2-CO-NH2 AND ITS PHYSIOLOGICALLY ACCEPTABLE ACID ADDITION SALTS WHEREIN ALL THE AMINO ACID GROUPINGS EXCEPT GLYCINE ARE OF L-CONFIGURATION. 